R1798 Rain Cap - 1 1/2" Fits Massey FergusonOne New Aftermarket Replacement Rain Cap 1 1 2" for Massey Ferguson, John Deere, Case IH, Allis Chalmers, Ford, and More Tractors This 1 1 2" exhaust rain cap (weather cap) sits atop a vertical exhaust pipe (muffler stack) and uses gravity and air pressure to remain closed when the engine is off, keeping rain, snow, debris, and pests out of the exhaust system. It opens automatically when the engine starts, allowing exhaust gases to escape freely. A